It was entertaining. Thank you for posting both a Linux and browser build-- that means a lot to some of us that would also like to give feedback on games. Just some quick feedback:
- It was a little hard to realize exactly what was going on, at first, but I figured it out
- One thing I noticed right away is, you can leave the heart power-ups on the ground, and it halts all ground movement from the invaders, so you only have to focus on the flying ones
- You can't shoot through powerups-- you have to pick them up in order to shoot where you want to
- I like that you can upgrade while playing
- Good job on the theme restrictions
- Convincing retro feel to it