Thanks Aglar, this game is very edit-friendly, so there shouldn't be any problems editing it in. :)
EDIT: I edited this in now, without any problems.
EDIT 2: I have now finished world 6. Only level 6-10 have a slightly changed strategy compared to Ragowit's TAS.
Here's the WIP.
EDIT 3: I have now finished world 7. There are quite a lot of new strategies on this world - levels 1,6,7,9 and 10 all have new strategies. The biggest improvements are levels 9 and 10 where I saved 284 and 114 frames respectively. Levels 1,6 and 7 all have minor improvements. Can you spot them?
Here's the WIP.
EDIT 4: World 8 finsihed! Most of the levels on this world are extremely simple, their purpose is mostly to introduce the new black block and its properties. This is why I was able to complete this world to quickly. Because enemies move at a different speed in the U version compared to the E version, I have to use a slightly different strategy on 8-10. I'm not completely satisfied with how that level looks now, but I'm not so sure I can save any time over the solution i have. I tried several different strategies, but this one turned out to be the fastest. No other level in this world uses a different strategy.
Here's the new WIP.