Good prototype. It needs a bit of polish.

-The balance is a bit off, it's super easy (barely an inconvenience) until the bear boss and the previous stage to the octupus boss. After that it gets a bit harder and you have to choose your upgrades carefully. Those are the only challenging levels, the bosses and the previous to the octupus.

-The upgrades are very expensive after 19k (it jumps to 59k that unless I leave it grinding for hours I won't get with regular gameplay).

-It needs a bit more, maybe chests or a shop to buy temporal buffs (like a health potion or an attack potion that lasts 1 fight or 15 seconds...), to break the monotony and make it a bit more strategic.

-The stages are too linear, if you can kill the first mob with your setup you can probably kill the 50th mob. They don't scale in difficulty.

-You should be able to refund individual upgrades, clicking on "refund" and having to deselect all and select all over again to change ONE skill is a bit tedious, sometimes you just want to switch, for instance, gold farming for a crit chance.

So far it's a good prototype, I wish the dev could tweak a few things to make it less monotonous and more challenging and strategic.