A note about my judging: My rating scale starts at a baseline 3/5, anything good done raises a score, things that are less good can lower a score. Genre is rated generously. As a game-developer I know that when giving feedback, while I can give suggestions, it's up to you as the developer to determine what accords with your vision.
3/5 Enjoyment: Camera's a bit fast and there's a section that you have to be warned off of trying. I tried anyway and decided to accept the warning after that.
3/5 Execution: Speedrun clock is a nice touch. Generally solid world/enemy designs. Combat feels good. Considering you went custom-engine it feels pretty good, if a little 'fast' and imprecise overall on the controls.
3/5 Sensory: No music but something about these graphics is doing it for me for some reason. Feels almost like playing Duke Nukem 2 in monochrome.
2/5 Metroidvania: More of a stage-based platformer in the end.
Overall: Honestly, good show. I don't even have very many notes, except to maybe try and get some old-.MOD-esque music to go with these retro sounds and graphics, get a bit more precision into player movement, and (for this jam anyway) try to incorporate a bit more exploration for the genre.