Well, of someone like this and have a hard time, here's my point:
1. At low lewels forget the sets and so on. Just rush. Don't farm any sets, wait for the final battle :)
1.1. It's ok to go with 2-3 cats, if you lose something. You may get a key and have much more smooth performance.
2. Have at least 1 healing cat for 2 boss.
3. Level 3 is only matter of jumps to bring at least 3 cats to the end.
4. At the last level start with turtle suits farm. That's enough to fight any level mobs.
5. Only 2 cats - Halo suit (range dps + healer) with any melee (no rebound works best) is enough to pass last boss.
6. Lags are the biggest problem, but soon you'll learn how to do that jumps. Also, game random is strange.
Well, a typical launch: chaaarge ... going about 40-50 speed, lots of stars, bubbles, jumping high over the sky ! Lava reached - speed drops downto 20-22. Let's use my jet .. speed over 30-40 again, goin 2-3-4 jumps .. some birds and meteors in a row, and you are at 7-8 speed again, damn agony without any chance tyo get any stars over your head. 3k+ distance, some "second chances" and again.
Lava stage is too boring :)
For all who have troubles with the elevators: plan your hotel - place public services on lower floors, suites on upper. Have different lift shafts. Change standart rooms with suites whe possible.
 "Idle Civilization"){kind=icon}
 "StrikeForce Kitty"){kind=icon}
 "Froggy Splash"){kind=icon}
 "Theme Hotel"){kind=icon}