Nice! Took a good look at your map, and it is well-made. I never played it myself, but I do like seeing such freeware games being mapped for preservation and additional appreciation about their artistry.
If any part of the map gets obscured or occupied by the HUD, don't worry. I don't know any tools about extracting maps from any Clickteam engine made games(not that I've seen any), but, if you're still concerned, seek and ask anyone who's more experienced in it.
The overall map size, from its time, I can see it was from when we didn't have very huge maps yet, but I can guess the small rooms put together in a whole map took some memory Derek Yu had at that time, guessing from plenty of Megabytes to maybe a Gigabyte or so. The complexity's quite noticeable, though.
Really not bad. You got about every secret and hidden Easter Egg room down, too.
And, I could think the game was made through Multimedia Fusion 1.
The map submission button is found on the site's homepage, labelled "Contribute". That's where you can submit your map. If you're in thought of some slight refinements to your map before that, well, the decision's up to you.