pretty good overall! My only criticisms are kind of... dependent on other things.
First, were you going for a continuous or sectional T&V? For continuous, you may think about how pachebel's cannon goes--gradually increasing in complexity and whatnot with each variation. In this one, you increase in a fairly standard way, but it's all in the same variation, which makes it kind of disjunct when you get to the "sections" within the variation--it sounds too abrupt switching from 8th notes to triplets to 16ths. Then your 2nd variation slows way down, which would be fine... but maybe too soon and ideally you'd want to come up afterward, end on a high note, so to speak.
If you're going for sectional, you may want to add some more definite breaks in it at the end of each variation.
Really in either case, what I would do, FWIW, is space out your thematic stuff a bit more. Do a whole variation with 8th notes, then triplets, then maybe a slow one in A minor, then... at least end on 16th notes, don't necessarily have to start with them. Also in the early ones try to maintain a lot of the original melody, in this one the melody kind of gets lost in your first variation where you're just sort of playing with the harmony, which is common in later variations but as a first one... functionally the actual melody isn't "in our heads" enough yet to see enough similarity between that and the original melody to really perceive it as a variation.
I like the way it sounds overall, this is just a bit of a mix of "how 'they' did it" and "how 'I' do it" as constructive criticism