Not sure if this feedback matters anymore, but I can't honestly say this lite-version gave me any confidence to want to give a purchase. The tutorial text was cut off so I couldn't completely read it and as I played I had no feedback or UI elements that really told me what to do or that I was doing anything at all.
The gems would disappear but I didn't know if I needed to collect all of them or if they'd open up a door at a certain threshold. I see that there is scoring and a mini-map so maybe those features in the full game would make all that apparent. I think maybe a demo/lite-version of the game that encompassed those features in a limited sense (like level one or a timed playtime) would be better to showcase your game.
Also, I would really say a pause screen is a feature of the game. Would you buy a game because it said a "pause screen" was a feature? Most people would just see that as something that should be there regardless.
I hope this feedback helps and please don't take anything personal. Trying to provide helpful feedback. I think it's great that you managed to to put something together and publish it as I hope to one day get to that point. Great work, man!