I like the game and how you need to explore to get further, but it is unnecessary frustrating. Some collisions on top are glitchy and also sometimes the game makes you double jump and sometimes not, also I can get the player stuck on some places thanks to the wall jumping. You should polish the game more and explain better how the wall jumping works and what B does since I managed to get all the 10 coins without it. For a first entry is impressive and I know you can only progress from here and now if you are interested on making games.