just a heads up, you can use the dropbox link directly.
(Map 10)
Ok first major problem, you have no way for anybody but tails to get out of the lava pits.
You have a ceiling crusher with missing upper linedef textures making it invisible once its ceiling is no longer visible. Other walls also appear to be missing textures
For what ever reason, badniks are falling off of platforms (minor)
Knuckles is unable to climb many walls witch contributes to the lava pit problem
after taking a teleport to another part of the level, I expected to be able to pop open a badnik, it's like no collide got turned on. This means you made your level too big.
After opening up your map in Zone builder I discovered what made you map too big. you got the sky box ans control sectors too far out.
you also have a classic level design problem of crossing linedefs. I wasn't aware this was still possible with zone builder.
Some of your linedefs are even flagged as impassible when they shouldn't be.
In releation to that, along the path where I found this, you're missing springs to allow sonic to get up the ledges. sure the player could proably just spindash up the slopes, but the way the path is built, that's not going to be the best solution.
Unfortunatly, when I fixed the collsion issue I found another impassible linedef that if not fixed makes the level unbeatable.
on a lesser note, I found badniks and other objects just hideing in the walls in zone builder, indicating that there may have been cut paths.
To fix most of these problems, your level needs to fit into 1/4 of the total work space. Basically the same physical space of a source map (I took measurements)
Without fixing this map, Sonic can't even complete it.
(Map11)
it's a boss stage. no points off for that.
But points off for starting the player off with a near blind hazard. At least you compensate with an extra life at the start.
The boss arena is too dark you need to increase the light level of the shadows so the Robotnik is visible.
Slopes I discovered don't render ware right when water is only part way through them. to fix this the water, or lava in this case, needs to either be above or below the slope. (Ran into this one with Skytop)