It's buggy, like when you get attacked as the archer, you can't attack back, your arrows just go through the enemy until you die. The start of the level is very slow to have to play through every time, even at 2x speed. The upgrades are pretty boring, I want to unlock abilities and synergies during a level, not just damage +1 and attk speed +20%. I know there are some abilities in the crystal shop, but there's not anything interesting here to keep me wanting to grind for them. The other 2 characters don't seem playable, maybe cuz it's just a demo but some indication of how to unlock or why they aren't unlocked would be nice. Could be something good, but at the moment it's just a bit meh...