Really solid and impressive entry. Fun to play. Took me a while to get into it because there is not enough guidance, especially early on, but I'm glad I stuck with it. I agree with a lot of the good feedback here, so I'll just comment on a couple things:
1. At first I thought the healing was broken because I bought hp and nothing happened. It wasn't until I double-checked the controls on the game page that I realized I had to press 1.
2. Important item pick-ups are very easily missed bc the little words come and go quickly.
3. I didn't even realize that shift to boost was a possibility. However, I found it too difficult to make use of.
4, There are some enemies that shoot you as soon as you enter a room. That feels unfair.
All in all, this is fantastic work and one of the best entries I've played so far.