Hey I gave it a play. I like incremental games, and this is close to scratching that itch. But I'm not sure I like the darkness component, and couldn't figure out anything about candles making it better. If there was a clearer path to controlling the light, that would help (and there may be and I might have just missed it, so making that clearer would help). But overall, that is what took my attention, so I couldn't focus on what the upgrades were doing. And you couldn't see the animals, so I didn't really understand what they were doing or how to use that to my advantage. I could see a version of this game that's just in the light, and just breaking blocks, and as long as there are fun upgrades (and automations), that would be enough, and just keep stacking the blocks higher and higher so I can break them.
For some specific feedback, the UI could definitely use some work, like the interactions with the upgrade tree (it would be nice to be able to tell what is available, and what you can afford, without having to click). Also, the thing about purchasing things at the store, and slots, and what was in a slot, wasn't clear.
I think also, just speeding up the progression would help a lot. There don't seem to be many upgrades that speed up progression. There is the one thing at the store you can buy to increase your xp, but it's only for one level at a time.
I think you've got a good base set of interactions here, so just improving some of the UI, and how you mitigate the darkness, and the speed of upgrades will help a lot.