Careful with those levels! FL Studio Mobile has a pretty solid limiter, but it's still important to leave headroom for swells. I'm noticing a lot of mud in the low end as well - maybe take some of those water sounds down, and EQ the low end out of the sounds that don't require it. You can automate that, too, if you need to leave them for the beginning and end but make room once the main lead comes in, either :45, :58, or as a transition between those two spots.
I'm into the composition, though! The drums are a little boxy and out of place - maybe bring in some more liquid fx for percussion? But the leads are awesome, and I like a lot of the pads.
Overall, solid work. Just needs a little extra attention.