Not perfect, but good and fun, doesn't have much missing in features. If you find it for 10 $, open your wallet and buy.
In this game, you play as a war robot. You are locked in a tower with other war machines. You are supposed to defeat the enemies, find the right rooms, encounter the bosses, and then go to the floor boss. Every floor boss is very special and have many tricks, some take many tries to win. You can customize your own war robot with pistols on the heads or crossbows, blades on your hands, hammers and axes, lasers, rocket launchers etc. and unlock more pieces for upgrading. You can also get enchantments on the weapons, and every weapon has a heat level and cooldown. All of them have ammo, even melee weapons, when you run out of them, you fight with only your hands.
The graphics aren't perfect, but it doesn't make you die. The fast combat system will make you ignore the bad quality textures on a wall, and you will automatically take cover behind that ugly thing.