Nice entry. The damage indicators feel good and the overall tension works well.
A few notes:
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Most players won’t remember what each cube color means (collision, no collision, etc.) from the intro screen. Relying on color alone isn’t enough. Consider using distinct textures or clearer visual cues to communicate tile properties at a glance.
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There’s visual feedback when shooting, but no sound effects. Audio would significantly enhance the impact and atmosphere. Even simple SFX can make a big difference in how satisfying and immersive the game feels.
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Any in-game or UI text should be fully legible. Right now, only the damage indicators are easy to read. Other, more important elements are semi-transparent and use a font that reduces clarity. Improving contrast and typography would help a lot.
Overall, it’s a solid jam submission with a strong vibe and good tension that keeps players engaged. With more attention to UX and polish, especially feedback and clarity, it could become much more compelling.