Here's how my most recent game Jump Jolt is doing in its first week:
As your game Landr, the spike is very much down to being listed in the fresh section on the front page for a bit. The downward trend correlates with the game gradually disappearing from the front page.
It's interesting to compare the trend with my previous game Holey Suit, which I released over a year ago. That time round I got a feature spot, so the effect is a bit more prolonged as it took a while for the game to completely move off the home page.
Something further I can share, is how Holey Suit did since its release - over a year!
Basically it had a good run, and I was lucky to get that feature spot. However don't expect your game to stay in the limelight very long! Past the initial boost, being featured or listed in new/fresh, seldom few users will stumble across your title. Obscurity is the norm.
Twitter promotion has always worked moderately, but the impact is negligible compared to a feature / appearing on the front page. Truth is there are a lot of titles released each day, so it's a battle to get up the pecking order - but it definitely yields the most impact.