Tomb of Trials is a puzzle game that doesn't mess around.
You will die a couple times guaranteed, whether you like it or not. The puzzles can be very.... puzzling at times for better and for worse, but overall I really enjoyed the puzzles (except the invisible maze and level 7's staircase room where you need to fall precisely from one moving platform to another, though perhaps some changes either visual or gameplay related could solve my issues with these rooms).
The story isn't the focus of the game, but maybe the writing could have been better. Still, I got a chuckle out of the dialogue at times.
If the game will receive more levels/changes later on, I would recommend having some puzzles involving the flashlight (since for now it is only really used for cosmetic purposes, though it can be useful in certain areas), more physics puzzles, make the spikes visible (though I understand that this would make some rooms way too easy), and polish up the picking up and dropping objects mechanic since it can be hard to line up certain objects such as planks. I would also like a level editor, but that's just a personal want.
Overall, I really enjoyed my time with Tomb of Trials.