The game is great! I like the style and the simple concept.
My only issue was that the leveling system was kind of slow so a faster grind would make it smooth and not feel repetitive.
It would also be nice to have some variety of quick-time-events when it comes to the lewd stuff and add some different type of NPC's like other school staffs that visit Sumi for some entertainment.
Anyway the game is promising and I look for future updates. Can't wait to see more.