Paper Pixels is a really good choice for the art! The concept is interesting, here is some feedback:
- There could be a better visual feedback for the cost of everything in terms of energy. It took me a while to notice that even jumping had a cost. (I know it's mentioned in the first screen, but I ended up skipping the text when I first started playing because it was cropped)
- The movement/platforming is a bit rough sometimes, and I think the strong gravity and even stronger jump were partially responsible for this. Also, sometimes platforms would shoot you out of them, making you waste a jump.
- There is no reason to shoot enemies other than defend yourself, as there is no reward, and you lose a coin. This may be a design choice, but I found myself evading them more than trying to kill them.
- Maybe it would be nice to let the player land on ground before skipping to the next level when the energy is depleted. To have kinda of a "last shot".
Still, good job on the entry! It's a solid concept and a fun game to play.