- The concept is simple but works.
- Casual mode is so easy I thought I can't die ! The Hard mode is a lot better and should be the regular one.
- you MUST add sound at least for shoot/death/destroy and a Music for the mood.
- change your unity project name, it's actually 2dlesson (a tutorial I imagine)
- The pastel tone are a nice choice to be a little different from classic neon style.
- Lots of particles is always a good thing.
That's a nice game, simple but fun to play.