This is a super interesting idea that I could see being expanded into a really unique experience. The idea of slowly unlocking new worker and building types that help you further explore the world, without directly controlling the units, is a really cool take on the genre. My biggest piece of advice is that there is very little guiding feedback towards what the player should do or what they are unlocking, so adding a more gradually ramped tutorial, and adding better indicators of what caused different things to be unlocked or appear, would go a long way towards giving the player a better idea of their goals and what they should be working towards. This is a great start, so keep working on it!