I love hearing stuff like this. To me it's a diamond in the rough. I can tell you are a beginner/novice with compositional technique, but your writing and ideas are your own. That's the thing no one can teach, and you have such a cool unique voice that I'd be sad if you ever stopped writing.
I wouldn't say this sounds "rushed", but I think I know what you mean. There are things you fleshed out and developed (like the melody in the piano and the drum rhythms), but other parts you haven't (overall harmony is on 2 or 3 chords, bass part is boring). But what are you going for? I've heard plenty of music with a static harmony on a few chords, but melody and everything else are developed. For instance, as jaunty and extravagant as your melody is, it kind of meanders to me. Wondering around and noodling are fine, but imo there wasn't a destination. Since your harmony is static, what if you tossed the melody around to other instruments? Or gradually kept the melody notes rising to explore more of it's register? Lots of ways to expand this, just depends on what YOU want to do.
Another idea is to explore forms. Study up on simple ones like binary and tertiary forms. Search "simple forms for composition", I bet you in .3 seconds an overwhelming heap of information will come your way. What an exciting time for you to get to try your hand at all of this! Keep writing simple pieces, short ones, that you can complete relatively quickly. You'll learn a lot faster and inspiration of KNOWING you can write and complete a piece will keep you going when "the spirit" or whatever doesn't. Adhering to a form is an easy way to fix the "I don't know what to do next" problem.
If I were you, I'd keep writing for piano, or another instrument that's polyphonic so you can keep practicing harmony. AND, your piano writing will get better too. For instance:
One thing you could do is have the beam of the eighth notes cross to the bass clef to include the low G. That way the performer will instantly recognize your rhythm, and at least to me it would be easier to read. I wouldn't expect you to know that, and it's definitely NOT a mistake per se, but as you continue to study scores, you'll see all kinds of engraving that you may not have come across, and that's one way to get better. Your rhythm changes soon after, but it's readability is something you should always consider when notating. Also, if there are notes in the bass clef, I would put the pedal marking under those notes.
Watch out for stuff like this. The right hand notes go lower than your higher F note in the left hand, so it might be awkward to play.
I would have maybe given the more athletic sections to the cello over the bass, but other than a few things that are easily fixable with your continued growth, you have a lot to look forward to after writing this. I think the style and the cool harmonies with the piano over the block chords are unique and your own. I encourage you to continue to explore this forum as well as ask questions for anything.
Thanks for sharing, and good luck with your future music!