Hi, thanks for your feedback :) It's true that there's a problem with jumps, you can't see where you land and you get shot too quickly. I'd have to work on that.
Relative to the items in the shop, there are 4 in total :
- the purple portal, which adds an arrow to see where the portal is located
- the lightning bolt, which increases the speed
- the potion, the same as the one mobs drop, which heals the player
- the heart, which adds extra life, but doesn't heal