When I first started playing the enemies spawned pretty frequently and the attacks wouldn't hit them sometimes, making it a little hard. After one restart, the enemies stopped spawning, which I don't think was intended, and I could easily walk to the end of the level. I'm not sure what caused it, but after refreshing the page it worked again. Having the second cube didn't feel like it added much either, as the enemies mostly came for the guy in the front. Adding a bit more variety to enemies and a way to involve the second cube more into the game would make it more engaging in my opinion. It's still a nice concept though!