Played again after the earlier playtest.
It was already a fun and polished game and I think you have addressed all of my points of criticism. The preview is helpful and there are no levels that feel like difficulty outliers. The last level feels like a finale especially if you try to go for that star (I didn't, but I did beat it). I also enjoyed all the new concepts like trains and ufos.
Great game jam game, a simple concept done well.