itch.io

I think the web version is behind, actually. The downloaded Windows version has exactly what I was looking for. 
This is a really solid prototype! I'm definitely looking forward to more. I had a lot of success stacking up all my upgrades on one branch type. That'll be an interesting design problem for you to solve, since that was probably not the intended behaviour. Having mutually exclusive upgrades in the future (eg, an "ice" upgrade that slows and a "fire" upgrade that does AoE), might be one way to encourage a more complex build.
Also, it seems like all the upgrades give a percentage of the base values only (eg a 10% price increase always increases the price by 5). I'm not sure if this is intentional but it struck me as weird enough i figured I'd mention it here. 

I think you'll really benefit from giving a little tutorial (even in the game description to tell me how to get started) because I can't figure out what to do even with the controls menu.

You did an amazing job on this game! Loved all the little puzzles that fit into the world so well. I will say the last puzzle was quite difficult for me, so I ended up needing to find a walkthrough, which took me out of my immersion. I hope that's helpful feedback.