to start off, that was the worst game&watch of all time. D-air>D-Smash>S-smash>rinse>lather>repeat....
But i think your an average player. Slightly campy style, but thats okay. Your main issue is killing moves, you dont have to rely so heavily on d-tilt and d-air, it became way to predictable. Try Reverse -aerial -rushes and UP-TILTS.
Also, against both characters you should have complete control over spacing. Utilize f-tilts ALOT better, to keep them at bay. Most of the time your connecting the f-tilt at her thigh, which is a waste.
Last tip is, UP B out of shield. Please use it, even if you have tap jump off its possible. Theyre were way too many wasted oppurtunities.