So I'm writing a story in which an advanced alien race, for reasons unknown, takes some humans from the Earth and leaves them on a far away habitable planet. Before droping them off, the aliens do some genetic modifications on the humans. For example, they alter their immune system so that they can be safe from most microbes on their new home. Plus they alter a bit what their stomach can digest so that they can eat other lifeforms, such as plants and animals (not all of them, some of them are venomous). After these modifications, they leave them on their new home. This planet has the following differences:
•It's a roughly Earth sized planet, only a tiny bit bigger in diameter and mass. (Gravity: 1,5 g)
•It has an oxygen rich atmosphere, though a bit thicker than Earth's.
•The climate is mostly tropical, and most of the planet's terrestrial surface is covered by mass rainforests.
•The planet orbits a small g-type star in the habitable zone.
Now my question is, how would humans adapt to this new confitions?