The only problem is the transparent color.
Although most of them are OK, but it is better to keep the palettes same as original tim files.
Double Texture Enemies:
BlackDragonBattleTex RIGHT.png
GaraiBattleTex LEFT.png
HydraBattleTex LEFT.png
HydraBattleTex RIGHT.png
TyranoBattleTex RIGHT.png
Normal Enemies:
GloopBattleTex.png
JellyBlubbaBattleTex.png
MegaStarkyBattleTex.png
UnknownBattleTex.png
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BTW, Crossbone's texture is 128*176, should be 128*256.
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The Geos' texture works strangely, see below.