is the amp too powerful..and would it hurt or damage my speakers?

It's no problem to run 150 watt speakers with a 225 watt amps.  The amp is only going to output as much power as your volume setting determines.  Most listening is actually going to be in the 5 to 15 watt area.

Getting a more powerful amp is generally desired.  It's not because you want all that power.  It because you want the large power supply with larger transformer and capacitance bank.  This provide a much smoother sound with better current delivery to support strong bass and midbass signals, even if it's at low to medium volume levels.

The reason that an under-powered amp will be more likely to blow speakers is that people will want to turn up the volume.  You will reach a point where the amplifier power supply runs out of gas and the output signal is actually clipped or "flat-lined".  This flat-line DC current will ruin tweeters very quickly and could damage other parts of the woofers and crossovers.

It's always more healthy to get an overpowered amp so that you always have a clean signal output to the speakers.  It's better to send a "clean" high powered spike to the speakers.  They can handle a one time spike that is over their rated power easier than they can handle a "clipped flat-line DC".  It's very easy to hear when the speaker reaches maximum excursion and you can just back off on the volume (and don't hit those levels again).

With amp clipping, it's actually harder to hear when this happens.  You could be "hearing" a somewhat clean sound, but the clipping is occurring and slowly damaging your tweeter voicecoils.