So I talked previously in my other posts about well the summons.
Now I'm going to say that in the game there will be 6 summons, and well 8 bosses, 6 of those bosses once defeated can be used as summons.
Here is one of the bosses in the game.
The game will feature 8 levels, which will be around 15minutes each. Yes it won't be a long game, but I'd rather focus on making every element great, than doing loads of boring levels. So at the end of each level there will be a boss to fight.