https://www.twitch.tv/videos/2558804499
Idk seems like a solid idea, execution has a long way to go. I felt like some enemies were really hard to beat with some characters, may be skill issue. The upgrades were all whatever. I know this is just a tech demo, basically, but for a real game you will have to pace the difficulty and enemy variety better, start with super easy ones, offer some meaningful upgrades, then move on to more complicated enemies and higher numbers of them.