I've reached wave 8 at best.
The game is very fun, the javelin play works pretty well and does feel a bit original, the speed of everything feels right, and different upgrades are different, damage not reaching the life of an enemy, or piercing, or better range, it's really not the same. Lack of invincibility frame is brutal, you can quickly fall from full life to death from the same bunch of bullets, I like brutal feature though so I'm all for it.
Good job, thanks for sharing.