If instead of playing you're more interested in making cool sounds, I'd skip the keyboard completely and download a free DAW like Reaper, Ableton, or FL Studio.
Whichever route you take, the secret is practice. It always is...
Constraints can be a great thing.
But it can't help you learn piano, which is what the top-level comment asked for.
Alternatively, an Akai MPK Mini MK3 costs $100 and gives you twice the range, no limit on simultaneous keypresses, velocity sensitivity, a mod wheel, analog knobs, and velocity sensitive drum pads.
Many synthesizers (especially softsynths) map changes in sound to velocity, that is, how hard you hit the key. Hitting the key harder makes a different sound (e.g. layers more samples) than hitting it softly.
At the same time, if this is the best one can hope for on a computer keyboard, I feel comfortable resting my case.
This isn't necessarily a problem. As you say, constraints can breed creativity. A good musician should still be able to play great music, but for somebody just learning it's a lot of unnecessary friction.
You don't have that with a computer keyboard. Music is hard, don't set yourself for failure so early, for no good reason.