Hello!
Very well put together game! It feels very polished. Admittedly, this style of puzzle game is not really my speed these days but I have fond memories of playing similar games when I was little on my family's old Macintosh :)
The art was very functional and was nicely done. I liked the totally-not-Cthulhu Statues! The UI was very clean and polished, I liked the menus a lot. The music and sound effects were good if subtle. I thought they did a good job of setting the 'trapped underground' spooky atmosphere.
Gameplay was solid as far as a Boulder Dash style game goes. The puzzles are at a good difficulty level with the difficulty ramping over time feeling reasonable. I like the various enemy types mixing up the puzzle design, especially the slimes with objects hidden in them. I'd usually try to provide more constructive feedback but honestly it just seems very solid and would definitely be enough to carry the whole game with additional levels and maybe some extra variety in special units or tiles to spice things up later.
I think this is an excellent demo and the full version of the game will be very solid if you keep up this quality. Very good Job!
Our team have submitted a runner that combines Tetris and precision platforming if you'd like to check it out (Link below). Would love to get some feedback if you have the time. :)
I wish you the best with your projects!
https://itch.io/jam/feedback-quest-8-indiegames-x-indie-streamers/rate/3773442