Nice old scool 2D-shooter. Here is what I thought:
- Music and SFX was too loud, especially when all the SFX came together
- You should add an arrow when an enemy is outside of the screen so you know where to go.
- Maybe add an indicator how many enemies are left in this level.
- Loved the pixelart grandpa, don't think it fits with the dungeon background though.
- Don't know how this fits in the rewind theme.
How you could expand:
- Add different enemies
- Beefy one that takes more hits, moves slowly
- Fast one that dies quickly
- Add more guns So you can swap between them.
- Add environment items (things that can explode and hit everything in range)
Good job, hope you like the feedback