I don't know, all is possible with indie gala bundle. For exemple in this one bundle, there is the very cool "Buissons", made by the developer "Doc Geraud", who has a channel about game design, and there is too, very meh games like Fantasy Quest Solitaire, and even trashy things like this one I just giveaway here...

There's a lot of games like this. Run around in 2D shooting everything. A lot of spawns. Boss. Upgrade weapons. Someone made one that was probably successful, and that spawned all the copies.