First up: your game looks absolutely fantastic. Very inspirational!
Here is my feedback:
1. no back button in the settings menus was irritating (or at least a clue that Esc takes you back).
2. it would be nice to be able to move whilst holding the magnet. You cannot alway get the aim right, so being unable to move is a bit grating.
3. it be nice to cancel a throw action. Again, if you start aiming, and then realise ‘this position is no good, I need to move or cancel the throw action and then move’, but then cannot, it again is a bit of a nuisance. —> figured out, that you can aim with the mouse and right click to cancel … but this should imo be explained in the tutorial level.
4. The icons in the settings look a tad shabby. I assume this is just because it is the draft stage. It would be cool to replace these with cute pixelatures (if that is a word).
5. if you accidentally reenter a level that you've already done, there's no key there any more and you cannot get out. There needs to be a leave option to quit a sublevel. —> figured out, that you the menu option to ‘Return to Hub’ does this. But that is a little unintuitive. It would be imo nicer, you either displayed the option in the level (instead of in the settings), or allowed player to go back through the door.
6. It’s a bit dissatisfying when you get the key and the level just quits. It would be more rewarding if the player could go back to the entrance. E.g. in the game Swapper after obtaining the orb, obstacles are removed and the player can walk back to the entrance. That is perhaps not so satisfying, but in your game it would be very neat, if upon finishing the level, you could roll over to the entrance, and use the key to exit the room.
Looking forward to continued gameplay and look forward to the end product!