To not take any fall damage,
you can use a slam ability in the air (like the spiked arms)
or air dash just before hitting the ground
or land on another gremlin.

Landing on a steep slope curving into flat ground also increases the height you can drop from.

And if you do take fall damage, you won't take any further damage while tumbling. So you can take a calculated risk, deliberately crashing on a ledge to then safely tumble down cliffs of any height! (and you can fart to protect or heal yourself while you are still recovering from your tumble)

You can perform the grounded combo finisher instantly by attacking out of a roll (backwards too!). But the jump attack is your best attack:

• it can be spammed the quickest
  
• it allows you to move in any direction while you attack
  
• you can use it while balancing on top of most enemies
  
• it also avoids large creatures shaking you off

The high jump perk makes this harder to use on regular enemies and easier on the bomb spitter!

Are geysers getting in your way or putting you in danger?

You can plug them up with an item!

If you don't have a fruit ability in your team and no growing plants nearby, you may often find yourself without a projectile to throw. To avoid that situation, try to keep and take a radberry or battery with you, when you find one. They will never break and are thus reusable to collect crystals, unfold out of reach vines and bonk critters with. Of course you still can't climb with them (only get up ledges and platforms) - but if you have the finesse, you can throw them in tall arcs, follow with climbing, catch them and throw them again (even in the air!).

Moving while on a wall consumes a lot of stamina, just holding onto it - not so much! There are only two scenarios where you actually need to move and spend a lot of stamina on a wall: overhang walls and slanted ceilings (climbing a slanted ceiling upwards).

On vertical walls or steep slopes, you can grab the wall (keep your stick neutral to conserve stamina), jump, dash back to the wall if necessary, regrab, repeat. This will greatly reduce your stamina use and thus either reduce the time waiting for it to replenish or extend your reach for the stamina you have.

And on ceilings going downwards, you can let go, dash forward, regrab and repeat. Once again not spending any climbing movement stamina. This is also possible on perfectly level ceilings, but in that case you are more likely to risk falling if you miss the regrab (which might happen just from latency or game performance, if your or the host machine is struggling).

The sticky fruit goo can both temporarily extend your stamina when you eat it (or permanently for the trek when eating a more potent pill), but splashing it on a wall will also make you not spend any stamina climbing that section. And there are slugs that leave a trail of this sticky goo behind them, that try to flee when you approach. So if you see one of these, grab it, carefully drop or toss it on a wall (they are squishy, don't throw too hard). And then you can casually climb after them without any fancy tricks or spending any stamina.