Awesome little idea! I could see this becoming an awesome mobile game with a bit of polish and maybe procedural levels? I unfortunately got stuck on the same bit in both the overworld and hell, but the overall take on the theme was definitely awesome!
Here's some quick feedback I got while playing the game:
- The high jump was cool and an awesome concept, but it was a little on the quick side.
- I rarely used the shooting because everything was so quick, so maybe some balancing there?
- A pause menu goes a long way for UX, so if you get time in your next jam, that might be awesome to add!
- Audio would also be cool, some 8-bit sound effects like those generated by BFXR, could be awesome... And some background music too to match!
- The tutorial text at the beginning was also a little hard to read, maybe adding borders to it or a shadow would help in the future?
- Also a full screen / window scaling, but judging by the way you didn't use a "main 3" engine that may have been a little harder to support, totally be there!
Overall though, awesome little game with a lot of potential! I'm extremely interested though, what engine / language did you use? I've never seen a jam game with all the assets bundled into the exe before!
I've recorded a quick video of the gameplay while I played your game, hopefully you might find it helpful to watch how someone else interacts with your game!