Definitely one of the better games I have played so far.
I really like the simple art style and the nice music in the background. The glitch effect is super nice. The slow motion effect when two planes are close to a collision is superb. Very well done game design on that part.
But there are also some points that needs some improvement:
- I was randomly losing health in level 4 and 5. It also appeared to me that there were less airplanes around. Maybe some of them hit an invisible collider outside. You might want to check on that.
- Level 1 definitely was the most fun for me because it had the most planes and therefore was actually challenging the most. The following levels were all easier to me. There is definitely some tweaking needed.
- I had one occasion of two planes spawning close to each other and then colliding, without me being even able to see the character to react and prevent the collision. Should be simple to fix by just checking if a plane with the same color is near and then calculate a new spawn point ;)
- The game definitely needs some sort of speed up option. I think the spacebar would be a very nice key for that. If hold down, the game runs at 2x speed or so. At the start and end the planes were flying so slow and not even close to a collision that I could easily check my Twitter and stuff :D
- Althought the simple graphics are nice, I could also think of some more advanced graphics and effects (storm) which could make the game more appealing.
Please don't take my points above as negative. You have created a great game and I just want to help improve it ;)