The groove works well, but could do with some light & shade. Maybe simplifying the kick drum pattern in the body of the piece would achieve that. The song doesn't seem to lend itself to bigger crashes imo, so cutting back on those may help too. A few minor timing issues around fill exits means that you don't always nail those crash accents. Some fill variation away from the flam finish may help that too. Single flams are great, but they leave you needing to play the space. Filling that space (let's say with a straight half bar 8ths fill) will help keep both time and groove momentum.
All in all, a very pleasing effort, but because the piece is so simple, it has to be right on the money.