As you wrote in the review for Endtime, our games have something in common, so it's probably no wonder that we liked Monument straight away.
It instantly refers to a specific genre and develops it in an interesting way, not only inviting you to explore a faraway place, but the mysterious Explorer's obsession as well. A really neat touch, as are the memorials for dead characters.
Our advice is to always work with the flavor of the game to shape the characters: stuff like their initial description being played out as an interview wth the Explorer shouldn't be additional or optional, but a clear design choice to achieve a specific feeling.
On another note, we didn't exactly see the design goal of "a map with different portions belonging to different ages". We also think the game would feel more elegant if it didn't use two separate randomizers, cards and dice. If it was our game, we'd try to develop it so that it only uses cards.
Still, it's a really good game, with a lot of depth and complexity for the short amount of time you had to develop it, especially when you take layout and aesthetics into account.