I had to try a few times to actually make it past the first round. But I did manage to get up to round 2. I think the game is a bit difficult but the actual mechanic of flashing is really cool.
I think this game could be really cool right now, I think the biggest issues for me were the visibility of the enemies and the pickup collider for the ammo box. I would go to the ammo on the minimap and try looking for it but sometimes it was difficult to find or I just couldn't find it. And I would end up running out of ammo because of it. If the collider was a lot bigger I don't think that would be an issue.
The upgrade mechanic I thought was cool. A couple of bugs but this game was really good :)