it's just really boring. i barely feel stronger when i buy upgrades.. even many upgrades. and it's just grinding the same thing over and over again.
there were a bunch of pretty obvious things you could have done to make it more engaging and fun.
For one thing, since the positioning of your cursor matters so much for "area of attack", it's annoying that you auto-attack. The player should definitely click+hold to attack. Also the view should be a little less tilted so we can see stuff behind stuff and fully utilize the area patterns for simul attacks.
Nothing in the playfield is dynamic. No enemies or anything moving around. Just trees/shrooms/rocks sitting there.
Also these things we're collecting should be crafting not upgrading. Wood/stone/etc. are physical materials for crafting. Upgrades are purchased with things like "experience"
And upgrades should feel like they do something. Upgrading attack for example... feels like it does NOTHING. You way overtuned the health vs damage. I don't like when devs do that. They're way too preoccupied with making sure nothing is too "OP" that they don't realize they've sucked empowerment out of the player loop.
I could say a ton more but that's enough. The game loop is not empowering and that's why it simply wasn't that fun for me.