There's still some bugs that need to be fixed like the scene where Moku blacks out with Eva where the cutscene didn't trigger and I had to restart the game. There's also typos in the script that should be sorted out. Finally, some of the timed puzzles are overly punishing especially the (keeping it spoiler free) part where Moku says "they're breaking the floor and coming up" and that timed dash across the area. Also, I'm glad I read the True End hints otherwise I would never have gotten an indication of certain things that had to be done to reach it which should have been conveyed better by the game.
Story-wise I think the true ending was somewhat expected given the story hints but was depressing enough. The art for the character sprites and their portraits was amazing though especially the different expressions. I think you'll do a good job working on a visual novel.