Yes the game seems a bit slow (Namely movement speed, which also affects rate of profits, but this is in comparison to real life time it takes to earn enough for that next item), which is what lends it more to idle game, but could also be that I've been spoiled by other games ^^;
As for the rest, glad to know you do have plans, similar to what I thought of, already! And yes I have found the Easter Egg and toyed with it, it also appears in all levels in same spot, but after making a part too high in size it separates from it! XD ^^;