This song really fascinates me. It's so weird, and I hope all those odd bits are intentional, because that means you posess a talent for making very original music.
The tempo change is a bit unwelcome as it is, but with proper transitions, it can be a nice dynamic effect, as I'm sure you have pictured it. Especially how it grooves up everything when you go back to the original tempo
As Neblix says, some of the notes are played in a way that sounds unfinished. The piano roll, and quantize is your friend in tidying up midi recordings! (Not saying you should always quantize. It depends on how "human" you want your track to sound Neblix explains it pretty well)
0:42 - 1:09 Like I told you during the votings for this entry, that bassline is insane! My favourite part of the whole track.
Overall, if you can increase the production value, you'll give justice to the creativity you're clearly showing. Like Neblix, I'd recommend that you spend some time on filling out the sonic space of your track. This doesn't necesarry mean adding instruments (though it often does). There's a lot of monophony and few instruments in your track. Minimalism can sound really lacking when not done right. Have a listen at 1:06 and you can feel how the song just sounds a bit more right when the chords come in. I'm not saying you should shower your track with pads/organs etc. Not saying you shouldn't either To compensate for lack of instruments, you can focus on what made you decide to have few instruments, and what possibilities it offers. It opens up a lot of space so that each sound can be heard in its full glory, so be sure to start out with some amazing sounds that can stand on their own. From here fiddle around with eq, compression, panning, effects like reverb and delay and make your sounds fill out the sonic space, while not masking each other too much.
Also learn how to make silence in the sonic space a part of the song, as opposed to when it just feels like there's a lack of instruments. Not really sure how to do this myself, so If anyone could tell in here, I'd be interested in learning the trick myself
If I should guess I'd mess around with reverb/delay, and add some frequencies far from where the main frequency action is in the track (i.e. high frequencies for a bassy track)