The game idea is cool, but it feels slow. Maybe you could reduce the cost of upgrades and speed up the attack animation, or make the attack animation possible while moving.
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The game balance is just for show. I created the interface, wrote the logic, adjusted the animations + changed the central points of the pictures (so that the monsters and the character would not tremble in the animations) - there was no time for balance (((. but you can attack on the move, the main thing is not to move beyond the enemies.