So it looks like an Alpha release should be happening soon! I'm narrowing down the date, but mid-July to the beginning of August is the plan. I'll be releasing the first world on that day, and those early adopters would get the rest of the game (early and as it's done) free of charge. I think 40% of the final price is fair. It would allow people early access while still serving the purpose of funding.
The current structure of the game is 4 worlds with 7 levels each, with the seventh level being the equivalent of a castle stage. The first 6 levels are get from point A to point B successfully while finding a certain number of hidden objects in the levels. The completion of the boss at the end of level 7 plus the location of a minimum number (but not all) of the hidden objects in the world would unlock the subsequent world. Level 7 in each world will be more complex with branching paths, and the levels will steadily increase in length, complexity, and difficulty as the game progresses.
There is a central, simple level selection screen that seamlessly transitions to each level. Also a fun detail to note: the soundtrack is orchestral with electronic elements at times, but when you pause, it seamlessly transitions to a piano version of whatever music is playing until the action is resumed.
You can see an early version of level selection on Blight's IndieDB page