I mean, this is a interesting concept, but id like to mention some stuff. First the spawning limit is kinda terrible though I understand the need to keep it, but it just limits some of the gameplay. Some of the upgrades seem completely  unnecessary and after a while, the only thing stopping you from progression is exp. Character customization is infinite(its ok, maybe make it so watch ads for some(do not make it watch 15 ads or something), and the rest either level, or gold) but the gold you get so much that its kind of pointless later on, maybe make it do something else, or make a ability to transfer currencies or upgrades or something or just downright nerf it. I think it also might be a good idea for reset upgrade points, max button(one click spends all), and rebirth(most of these type of games have some type of rebirth but if you do decide to do this, as a player, I recommend you make it actually somewhat worthwhile instead of extremely small buffs, it isn't even necessary if you add some exponential growth or something). It seems like your going to try to get adds, and I would prefer a gui thing instead of a chest thing because in the end, its just gonna slow down.  collection speed. I think the money gained should be somewhat based on current money too, later on it gets kinda useless and annoying since it doesn't help with progress. The add boosts are too short, but since they are free and no ad, I understand, but if you add ads, please make it longer and not 3 seconds. The things I really like about this game is its very upbeat music, and the sounds which really improve the gameplay.