share knowledge (about card in your hand) card game

Hey there :)
 Your game has the potential to become an even better game than it offers players at this current state. The following are key pointers to improve the quality of  your game:
Puzzle Difficulty  Progression :
The level of difficulty in this game is not that great. The first level or introduction intgo the game remains the same even in the "next puzzle". The numbers and colors change, but the level of difficulty still remains the same. There is less possibility space to induce more strategic thinking which  basically defeats the purpose of a puzzle game. Players are not encourage to "think" more as they can essentially  just do a "trial-and-error" until they play all the cars in their hands correctly. The game could have benefitted greatly from a gradual increase in terms of difficulty to encourage more strategic thinking and thus greater satisfaction at the end of playing all the cards in their hand. One way to do this is to prevent players from proceeding to the next level before they solve the current level or puzzle. Provide hints in areas where players may potentially feel stuck within the overall game. To aid the gameplay experience, you can also introduce a storyline that links with the core mechanics of the game to create a deeper level of depth/immersion into your game. 
Discrete Mechanics:
At this point or from the play experience I had, the "look at" and "reveal card" basically do the same thing. The only difference is the naming convention used to separate them. Even when the player clicks on "look at" card,  what is shown to players  then  sometimes does not help them in trying to find a card that matches in either the number or the color. This makes the point of the button or "aid" mechanic counter -productive and thus players would not see the need to use and rely on their trial and error method until they get to the correct answer. The "reveal card" option also offers the latter fate. Which brings me to question your choices in including both of them and what contribution you think they added towards aiding or alleviating the game play experience. However , to improve this, you can start to think about how make both options aid players while leaving room for them to also use their own agency to figure out what the rest of the puzzle is. You can also limit how many times they "look at " card in each level or puzzle. In this way, both options offer different outcomes and thus gives players an incentive to want to use them because they offer different outcomes that overall improve the gameplay experience and encourage well thought out agency. Perhaps even make only one option available at certain stages of the game and then make the other option available at later stages or levels in the game. This decreases the cognitive load the game causes in players and they can focus on one aspect of the game  that will actually help them at a time 

Feedback Layers :
Feedback with a games design is so important. I cannot stress this enough. Currently, your game does not offer as much feedback as it is supposed to . The only feedback it offers players is the "no card to play " pop up message. This is unfortunately not enough. Players appreciate a sense of validation for the hard work they put in a game and some form of feedback that lets them know if they've solved a challenge  goes  a long way towards contributing to a better gameplay experience. Your game does not offer any of that and players have to assume that since they've played all the cards in their hand , they then have "solved" the game. You can improve this by letting players know of changing game states and tell them of their progress at each stage or level in the puzzle. This will let them know how much they need to think about and how far they are from completing or solving the whole puzzle .
I hope all this makes sense and will help improve the quality of your game:)Happy gaming !