I really like sudoku and played your game for a bit over an hour. I reached level 22 and lost because I ran out of seeds. I always picked seeds when I leveled up.
Honestly, I didn’t fully understand the roguelite approach. I would keep playing, but the game already has a lot of content, and starting over from the beginning is a bit discouraging. Maybe you’re cooking with the roguelite idea, but that approach wouldn’t hook me personally. I don't want to play the same levels again (not sure if you randomize them or crafted them by hand), but I would play straight to the last level if i could.
The game is really great. Congratulations ! it’s very well made and polished, I had a lot of fun.