Battle, by 
You’re entirely right when you say it was difficult to effectively add more eyecandy to this level. The tileset is simply horrendous… but the level compensated well.
I liked it. It had all the standard elements, like the tubes and the warps, as well as those hidden compartments that were thankfully obvious enough to discover even in the heat of battle. Moving from place to place was not a chore, either.
Problems:
1) It works fine for a battle level, but the level size could have been a little bigger— maybe gone a little more to the sides.
2) The less powerful weapons were found in the hardest places to reach, and the most powerful ones were found at the start of the level.
3) Like I said, even though this is a generally good level, the tileset is simply awful.
Despite that, I’d recommend this home-cooked level.