I removed the poll since it wasn't really serving any purpose. Please don't make a poll unless you really need to use one.
As for the level you've shown:
First off, I would personally recommend not
using savestates and rewinds when showcasing your projects. A well-designed level is one that its author can get through easily enough without having to resort to tool use. Plus, using a lot of rewinds in a video meant to demonstrate the level can be disorienting for us to watch, since we the viewers generally aren't expecting the game to suddenly teleport back in time.
Second, while your level thus far is a valiant effort for a newcomer (I like that you've tried to add some terrain variation, which is one area in which many newbies falter), it still suffers from a number of problems that plague beginners to level design. Namely, there is still quite a bit of flat land throughout the stage, and a lot of your enemy setups are just "several enemies lined up in a row", which can easily be evaded by "holding right and occasionally jumping". Try adding more platforms and variety in your setups.
Also, at 0:33 in the video, one of the corner tiles you're using for the ground (where the vertical and horizontal lines of grass intersect) is using the wrong tile. The grassy outline there should be curved along with the rest of the grass. This isn't a big deal gameplay-wise, but fixing this would make the stage look a lot nicer.
That's all I have to say for now - you're in need of some practice for sure, but if you persistently keep at it, I'm sure you could make quite a lovely hack.
I recommend showing us a full level from start-to-finish next time, so that we have more material to critique.
Quick side note:
Originally posted by BlueToad
What is this?
This question seems irrelevant? Blue Toad, you could have at least provided some feedback on the video. Please put at least a little more effort to your posts, especially in this particular forum.