I just gave your game a go and I do agree that the gameplay is very polished, it feels great popping the “coins” with all the powerups and stuff.
I was impressed when the music started playing matching my power up.
That said, I still think you could improve in some aspects.
Firstly, before I even get the chance to play the game it already asks me to connect to google Play Games, while asking for access to my files on Google Drive ?? that’s a lot to ask from a new player that has no idea if he will even enjoy your game ! Huge barrier there, needless to say I didn’t permit access to my google drive.
I think the interface is confusing, When selecting the character I couldn’t tell why I could pick some and why I couldn’t pick others. I did click the diamond but only later I understood that I was unlocking them (it was not clear before that they were locked, they looked pretty available to me).
On a Technical note, everytime I leave the game then go back to it the fonts are screwed up. They appear only as black squares:
https://i.ibb.co/BssjkjH/Screenshot-2019-11-15-15-11-09-935-fr-guillaumebattez-jumpinggame.png
I think this used to happen to me when i was storing BitmapFont objects in static members. You should not use static members to store libgdx disposable assets.
Lastly, I honestly think you should hire an artist. I really think your game feels great, but for me it just doesn’t come out as a commercial game with the current art. I can’t feel anything towards the Balls. I am not willing to spend real money on a slightly different… ball. They’re cute, yes, but just imagine that Angry birds were “Angry Balls” and their enemies are the evil squares. You see what I mean ?
Balls and squares do work when your approach is something minimalistic/geometric and all your game follows the same aesthetics. But in your case it feels like a Popcap game … but it doesn’t look like one. So something just doesn’t fit.
I hope you see this as constructive criticism because I was really impressed with how the game felt.
Anyway good work, and good luck !