Hey! Thank you for reporting this issue. I will try and reproduce it myself and fix it in the next version. Looks like I forgot to block the interaction while the animation of unlocking the building is playing. Should be a simple fix.
Ah hell, I forgot to give my thoughts on the game haha
It's very fun! Controls are snappy, camera movement is helpful. Not being able to see much was annoying but the problem went away with some torch upgrades.
I'm not the best at speedrunning though, so the timed challenges gave me the most trouble. Speaking of challenges, after unlocking the first tier, the very next level had its challenge active (tougher monsters) so I was puzzled at the sudden introduction of a new enemy type (the shooters) AND the drastic jump in enemy health. Might've just been a coincidence, but perhaps consider disabling challenges until the player has beaten a level at least once?
Also, this weird thing happened to me: after I realized you can press Down to descend while clinging on a wall, I instinctively started trying to press Up to gain height on a wall, but of course that didn't do what I expected. Now I have to unlearn that... Not sure if it's just me though