I'm surprised that Viscous doesn't tick all of the boxes for you. There is so much depth to this silly little guy that I'm still learning new things even after one tricking him for 100-ish hours (I forget to close the game, so my playtime is guesstimated). Pretty much every ability of his can be used creatively for both movement and combat.
Splatter's T3 has a low skill floor, but a high skill ceiling. You can use Cube to provide cover for teammates or as a stepping stone, you can put puddle punches on it, you can body block with it, it slides off slopes, it buffs mobility and purges debuffs, Splatter bounces off of it without using any bounces, you can use it right before getting melee'd so it pushes you away from danger, you can use it to pause the fight in order to assess the situation, etc. Puddle Punch lets you position yourself, allies, creeps, and enemies, and there is a massive list of interactions because it behaves the same for all players. I don't think I need to explain Goo Ball; that thing is notoriously difficult to use (though, it's been easier with the range buff and hitreg improvements).
Anyways, my point is that what you've described fits the motto of Viscous. There's so much you can do with him compared to the other high mobility characters that they start to feel rigid. Here's some clips of me getting away with being behind, and I am very much an average, sloppy player.
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The punch at the end here wasn't a fumbled puddle boost, I was just unsure if they were right behind me.
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Technically I died shortly after in the clip above, but that's because I got greedy
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I was in full panic mode here after the game ignored my alt cast button and cubed Pocket