Tip: Switch palace switches normally disappear if you replay the level. However, if you insert them as direct Map16 and use the hex-edit at $00EEB2 in the ROM map, you can replay the level without a problem.
Tap-Tap (boss) has been modified as follows:
1) he spawns a hopping tap-tap upon each egg hit
2) his jumps come much more frequently
3) his steps are bigger
4) doesn't wait as long @ beginning
Feel free to tweak values to your heart's desire!
Now, it is possible to set a flag using SPASM in order to determine whether hopping Tap-Taps will appear in a particular sublevel or not. This allows you to have hopping Tap-Taps in 6-4 but not 6-8, for example. The rest of the patch will still apply, so Tap-Tap will take bigger steps and more frequent jumps even if no hopping Tap-Taps spawn.