2d game kind of like overlord anime

2d game kind if like the overlord anime

Hey I making a 2d inspired by rhe overlord anime, but more based around necromancy, I have it so that u can collect souls when killing things or through other means I haven't decided, and then u can spend those souls to summon different minions. I plan on having a leveling tree for each diffretn basic type of minion so after awhile they can evolve into a different type of minion, like skeleton to skeleton archer and have there be diffrent paths so it could end up being like elder lich or somthing. I would obviously make the higher level ones cost more souls. I also plan on having a leveling tree for the player, health upgrades, magic damage etc. I want any ideas that could help me make this a enjoyable game so please give any ideas or advice you may have