Thank you for your comment!
Yeah, I'm planning to fix and balance "cooldown system": I have the same thoughts about it. "Progress bar on a player" - that is cool advise, thx!
A lot of ideas about some buffs and boosters, moving targets etc. I just ran out of time to complete some catchy additional mechanics. And will add all the stuff in the next version)
I hope you will check out the next versions of my game!