I enjoyed the theme of your game. It's pretty cute and fun. I don't think my comments will be super different to the ones that have already been posted, but adding some more variety to the tracks would definitely boost the effectiveness of your OST a lot. As it stands, a lot of them really only have one section. Taking some time to develop the songs more and give them some contrasting sections would keep your ears from getting tired as the songs loop. Manipulating the basslines in each song would also do wonders as the lines do get drawn out too much. I do you think you have a good base to work off of though, and the overall soundtrack is pretty cohesive.
I also wanna commend you for doing all your compositions in an online sequencer. It seems very limiting and it takes a lot of effort to push through those kinds of limitations. I don't know about your home setup at all, but if you can, I believe you can use Reaper for free forever *technically*, but nevertheless the license is very cheap if you wanted to invest. Pair that with endless free VSTs online and you can get a pretty good setup going for free/cheap, which would aid a lot in your compositional tools.
Overall, you made some solid music in a short time frame though and that's a net positive for everyone. Thank you for the entry!