Good job for getting your first game out! The concept is good, and the sound and art was nice too. Some things that can be improved:
- You should show where the player spawns before the level starts
- Dying should restart the current level rather than go back to the very first one
- Instead of stretching the sprites you could tile it so it looks better
- “Guide” button doesn’t do anything
- Try to find/make some custom UI elements instead of the default ones
- You uploaded a debug build, which is larger than a release build and contains unnecessary files