It's a pretty fun little puzzle game
At first, it felt like the timeloop mechanic was just slapped on there with no real purpose, but later on you do make good use of it with the Stasis Chamber and the Time Freezer
I will say however, that the game does not teach its mechanics very well.
1. I think it's a much better idea to actually have a tutorial level that tells you how to play the game rather than a wall of text you need to read instead.
2. Putting the Shop inside of the Esc menu isn't a great idea as the Esc menu also has the quit and settings buttons. Which usually, menus to play the game and the settings menus are two separate menus because one is to actually play the game, and the other isn't. So it can make it hard to find this shop menu. Not to mention that switching from buying and selling is a little clunky
I think what would have been better is for every item which you can buy in that level to be on the side of the screen, either on the side or on the top, which has all of the items you can use, as well as your total budget and remaining budget (though the total budget being on screen at all times isn't super relevant after you start placing stuff, so I'm not sure if it needs to be there at all times). And then also having the sell button next to everything as well. It would also be nice to have either a sell all button or a restart button that isn't going back to the menu and then going back to the level. What could also help things is having sell and buy mode being toggled by a key press, because part of the clunkiness and repetition of it is going into the menu, selecting sell mode, selling the machines, then pressing Esc to get out of sell mode, then pressing Esc again to buy the machines and then placing down the machines. If it was just a key press it would be much quicker and less annoying.
It also isn't super clear what mode you are in. Sure, you click sell mode and what not, but I think it would look a little nicer for there to be some kind of change depending on which mode that you are in outside of just the cursor
3. It took a little bit to comprehend how the Time Freezer worked. Now that I understand it, I don't know why I was confused. But I think it's a little hard to really see what it is doing and it's hard to really comprehend how it freezes things. I think a graphic that shows everything frozen would help really understand what it is doing.
Some other things to note is that it would have been nice for there to be some background music.
And that Level 7 appears to be impossible, because I can't place anything on the row with the Copper Ore, or any of the rows above that row. So I am unable to finish the level.
However, despite that, I still found it fun and interesting. But it isn't great at teaching the player its mechanics or having a very intuitive UI which I could see some players not understanding what to do and not wanting to bother to figure it out for a gamejam game.