Really good map for your 2nd map! I'm impressed at how much is going on in the map and what you took from the original Sonic 1 level and translated it to a srb2 map. However there some points that need to be looked at. Bare in mind I tested this with Match in mind. It plays really well in tag lol
Ring and Panel placement does need to be looked at - Feels like there isn't enough rings to actually have a chance to fight back in bigger games, players will probably scramble to find rings during a confrontation.
Panels should be spread out across the map rather than having clumps of panels in areas. In the middle its: 1 rail panel, 1 Auto and 1 Infinity. This makes confrontations centralised in one area making the map feel smaller and other areas aren't worth exploring to get shields/other panels etc
The lack of Solid mid-texturing on the green fences and the yellow caution barriers caused me to lose my footing sometimes and fall into the pit, that confused me because where the thunder shield is where the flame jets are - the yellow caution barrier is solid there? Feels inconsistent.
Some areas at the bottom of the map don't have a light block extending to the bottom, the white flat texture is disorientating and should be swapped out for something that isn't just 1 colour shade and most if not all the rings/panels don't float.
Look forward to see how you improve this map AND what you come up with next!
But anyway thanks for the advice.