Hey there,
First of all thank you for the game. It was a challenge but once I figured things out it was actually pretty decent and I finished it soon after.
I do however have some feedback for you if you're willing to listen. If not, then thank you nonetheless for the game and you can stop reading now :)
- The dragging of the cursor, I've read below what your intentions were with this effect but it's kinda distracting and something a little buggy. Maybe for a future project you can program it so that objects become highlighted or something when they get into reach and become interactive for the player.
- I realise you're new to game-dev but I'd advise you to add more sounds and/or music into the levels. The first level was pretty quiet and I think adding some music or general sound effects could really improve the ambience of the game. The music at the end, untop of the stairs for example is a great example, it really added a sense of achievement!
- Lastly I want to end this off with a positive and say that I really enjoyed your design choices and puzzles and I think adding the things I mentioned above would do them even greater justice.
Thanks again for the game :)